devstack ceph(adm) only deployment

local.conf

[[local|localrc]]
ADMIN_PASSWORD=secret

########
# CEPH #
########

CEPH_GIT_URL=https://review.opendev.org/openstack/devstack-plugin-ceph
enable_plugin devstack-plugin-ceph $CEPH_GIT_URL

CEPHADM_DEPLOY=True
CEPHADM_DEV_OSD=True
CEPH_LOOPBACK_DISK_SIZE=10G

LOGFILE=/opt/stack/logs/devstacklog.txt

disable_all_services

# we don't want to create the secret file at this stage
ENABLE_CEPH_NOVA=False

IP_VERSION=4
SERVICE_IP_VERSION=4